package java8_4;

/**
 * @author oldliu
 * @since 1.0
 */
public class Hotel {
    public static void main(String[] args) {
        final double PI=3.14;
        System.out.println(PI);
        //PI=3.15;
        int age=29;
        System.out.println(age);
        age=22;
        age=20;
        System.out.println(age);
        //String  age=23;
    }
}
